Can't resize armature without it disappearing or worse
Import DAE with Import Units option enabled.



Thant's what I get when imported ... (not so far or behinde as you wrote). Scale of armature is 5, but objects are 1, that make a difference. All is rotated in Y axis, but better fix that after meshes are not parented to armature. Also I would recommend to Apply Rotation (Ctrl+A) > Rotation before parenting meshes back to an armature to avoid other issues.



To fix Scale:


Select Mesh objects and Clear Parent (Alt+P)
Select Armature and Clear Scale (Alt+S)


Then you can parent objects back to armature (select meshes, armature as last to be an active object and press Ctrl+P).



BTW: hand seems to be in a wrong position and meshes are not assigned to the armature